Abrasive member.



J. 1. HATcH.-

ABRASIVE MEMBER. 7

APPLICATION FILED JUNE 2, 1919,

[MENTOR WITNESSES ATTORNEY Patemeq' July 1 1912;

JOS EPH IRVIN HATCH, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO GEORGE HI SIMMERMAN, OF PHILADELPHIA, PENNSYLVANIA.

ABnAsIvn MEMBER.

Specification of Letters Patent.

Patented July 16, 1912.

Application filed June 2, 1910. Serial No. 5 64,724.

To all whom it may concern:

Be it known that I, JOSEPH IRvIN HATCH, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and. State ofPennsylvania, have invented a certain new and useful Improvement inAbrasive Members, of which the following is a. specification.

My invention relates to a new and useful improvementin abrasive paper,cloth and like material, used in the form of disks, wheels and stripsfor grinding, smoothing and polishing, and has for its object to providesuch devices, that will engage, hold or absorb the small particles ofmaterial which would otherwise be thrown off as dust from the materialbeing ground or polished.

With these ends in View, this invention consists in the details ofconstruction and combination of elements hereinafter set forth and thenspecifically designated by the claims.

In order that those skilled in the art to which this inventionappertains may understand how to make and use the same, I will describeits construction in detail, referring by letter to the accompanyingdrawing forming a part of this specification, in which a polishing diskis shown.

In carrying out my invention as here embodied, I impregnate with hotwax, paraffin or similar material the abrasive cloth or paper, takingcare to remove any surplus wax which may appear upon the abrasingsurface.' 7

One of the objects in applying the wax hot is that it may thoroughlypenetrate the entire body of the abrasive material, makmg'the lattermoisture ,proof throughout, so that even though the edges of the disksor strips made therefrom may wear away no moisture will be absorbed. a

It is'a Well known fact that in practice the polishing disks, strips,etc., which are usually made of sand or emery paper, ,throw off aconsiderable amount-of dust when poll'shing gold or other "preciousmetal, due to the fact thatthe abrasive material rapidly powders andWears away on account of being dry and brittle and from the wearing awayof the metal being polished. This throwing off and losing of the golddust in dentistry and in the arts (work on all precious metals) amountsto considerable. By the use of my improvement these disadvantages areentirely overcome, since the coating of wax or like material which Isubject the abrasive material to will make it more pliable and lesslikely to crack, and acts as a lubricant, and also prevents to a largeextent the powdering and falling off of the sand or emery, likewise thedust which would otherwise arise from the metal being polished adheresto the surface of the abrasive material and becomes embedded in thecoating of wax, so that not only is the abrasive material made moredurable and will perform its work for a greater length of time, but thegold dust is all retained and may be readily reclaimed by smelting orany other Well known process.

While my invention is especially adapted and valuable for polishingdisks, strips, etc.,

'for dental use, and in the arts, on account of the value of themat'erialgold--op'erated upon, it is also desirable for many otherclasses of grinding and polishing, and especially where the dust arisingfrom the work is a serious objection, since when a grinding or polishingwheel is made in'accordance with my improvement, all of the dust will beabsorbed and held upon the wheel.

One of the advantages of my improvement for dental polishing disks isthe application of the wax makes the latter m0isture proof and thereforeprevents it from absorbing moisture from the mouth of the personoperated upon and also enables the operator to grind and polish work inpresence of moisture. I

Having thus fully described my invention, whatI claim as nw and useful,is-

1. An abrading member having a sheet or fabric back, a gritty orabrading substance secured directly to the back and forming thereupon anabrading surface and a coating of wax-like material on the abradingsurface of the member.

2. A polishing disk of the class described having a gritty substancepreliminarily secured thereon, and an envelopin coating of wax-likematerial evenly app 'ed over the gritty substance after the latter isagfixed my signature in the presence of two gliid to the1 diskhandgeifiori the use of t subscribing witnesses.

is to'ren er t e sai is impervious to 1 moisture and also to retain theloose perti- IRVIN 5 cles of the gritty substance and of preclousWitnesses:

metals intact with the disk. E. Bmmows,

In testimony whereof, I have hereunto af- A. ""W.

